Second, the management technology of raising ducks in fish ponds
1. Select the appropriate water surface. Generally, adult fish ponds and second-year-old fish ponds with an area of more than 1 mu and a water depth of1.5 ~ 2m are selected, and suitable rivers, lakes and reservoirs can also be selected. Slope protection should be built for sand ridges on newly dug fish ponds, pond ridges with loose soil and duck pens. In addition, ducks are generally not suitable for one-year-old fish ponds, and rice fields are not suitable for mixed culture of fish and ducks.
2. Choose the right way. At present, there are three main ways to implement integrated management of fish and ducks: first, grazing. Is to scatter the ducks on the surface of the pond or lake and rush back to the duck shed at night. This method is beneficial to the breeding of large surface fish and can also save some duck feed, but it has little effect on improving fish yield. The second is to raise ducks outside the pond. That is, build a duck shed near the fish pond, set up a cement activity field and an activity pool, and wash the duck manure and residual materials from the activity field into the fish pond every day. This way is convenient for centralized management of ducks, but it can't give full play to the advantages of mutual benefit between fish and ducks. Third, fish and ducks are mixed. That is, build a duck shed on the bank of the fish pond, enclose a part of the fish pond as an activity venue, and put the ducks directly on the fish pond. This way can give full play to the ecological effect of mutual benefit between fish and ducks.
3. It is generally appropriate to put 100~ 150 ducks per mu of water surface in a reasonable fish pond. If more than 200 fish are released, filter-feeding and omnivorous fish such as silver carp, bighead carp, tilapia or crucian carp are the main ones, and grass, bream or herring are not the main ones. In addition, pay attention to changing water and increasing oxygen. It is not advisable to raise more than 250 ducks per mu in fish ponds, otherwise the fish yield will drop significantly.
4. Strengthen feeding management In order to facilitate the centralized management of ducks, some fish ponds can be surrounded by old nets, screens and other materials as duck activity pools. It is best to raise 2-4 ducks per square meter of water surface, and the height of the net is 40-50 cm above and below the water surface to allow fish to enter and exit freely. Every morning and evening, the ducks are fed in the embankment activity field. After the ducks enter the shed at night, the duck manure and leftovers on the field are cleaned up and put into the pool. Drive the ducks out of the shed in the morning, pick them up and clean up the duck manure in the shed into the pool. In summer, ducks excrete a lot of feces, and the water quality is too fat. It is necessary to replenish fresh water in time and reduce the amount of fertilization.